Degradation of dimethoate and pirimicarb in asparagus - Journal of

Jul 1, 1985 - J. Agric. Food Chem. , 1985, 33 (4), pp 763–767. DOI: 10.1021/jf00064a051. Publication Date: July 1985. ACS Legacy Archive. Note: In l...
0 downloads 0 Views 623KB Size
J. Agric. Food Chem. 1985, 33,783-787

Odanaka,Y.; Tsuchiya, N.; Matano, 0.;Goto, S. Anal. Chem. 1983, 55, 929.

Pyles, R. A.; Woolson, E. A. J. Agric. Food Chem. 1982,30,866. Rumburg, C . B.; Engle, R. E.; Meggitt, W. F. Weeds 1960,8,582. Sachs, R. M.; Michael, J. L. Weed Sci. 1971,19,558. Sanders, J. G.; Windom, H. L. Estuarine Coastal Mar. Sci. 1980, 10, 555.

763

Sckerl, M. M.; Francs, R. E. Weed Sci. 1969, 17, 421. Wrench, J. J.; Addison, R. F. Can. J. Fish. Aquat. Sci. 1981,38, 518.

Received for review August 20,1984. Revised manuscript received March 20, 1985. Accepted April 30, 1985.

Degradation of Dimethoate and Pirimicarb in Asparagus Sunny Y. Szeto,* Robert S. Vernon, and Marilyn J. Brown Dimethoate at 0.25,0.50, 1.0, and 1.12 kg AI/ha, and pirimicarb at 0.125,0.25, and 0.50 kg AI/ha were applied as foliar sprays to control the European asparagus aphid, Brachycolus asparagi. Partial conversion of dimethoate to dimethoxon, and pirimicarb to (methy1amino)pirimicarb and/or formyl(methy1amino)pirimicarb occurred in the foliage (fern) as soon as 6-12 h after application. After applications the total residues of both compounds, including their toxic metabolites, decreased by about 90% in 7 days but at a slower rate thereafter. Only traces of pirimicarb (